The Nitro 640 2007 vs Nitro X-5 2010 comparison sits squarely in the category of decisions where specs alone won't tell the whole story — intended use, storage, and long-term ownership costs all factor in.
On paper these two are close siblings in the size department — Nitro 640 2007 at 16,0 ft versus Nitro X-5 2010 at 17,3 ft. Weight tells a clearer story for trailering families: the Nitro 640 2007 tips the scales at 1 092 lbs — 1 079 lbs more than the Nitro X-5 2010 at 13 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.
The power gap is worth calling out. Rated to 115 hp, the Nitro X-5 2010 has a 25-hp advantage over the Nitro 640 2007's 90-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads — 24 gal and 26 gal — so range won't be a tiebreaker here.
For family outings this is probably the sharpest distinction between the two. The Nitro 640 2007 is rated for 4 passengers, while the Nitro X-5 2010 caps at 3. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Nitro 640 2007 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Nitro X-5 2010 comes in at 0 lbs per hp versus 12 lbs per hp for the Nitro 640 2007. The lower the ratio the more explosive the acceleration — meaningful on a short RIB where bursts of speed, quick planing, and agility in surf or tight waterways define the experience.
Bottom line: Choose the Nitro 640 2007 if your priority is putting more people on the water — it handles 4 passengers and at 16,0 ft it has the deck room to back that rating up comfortably. The Nitro X-5 2010 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 3 that costs less to run day-to-day.